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Anybody switch from standard 727 gear ratios to 904 1st and 2nd ratios and improve your et?

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Anybody switch from standard 727 gear ratios to 904 1st and 2nd ratios and improve your et?

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Without any info it's an impossible question to answer. With info it's a 75 post re-hashed arguement.

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'66 Coronet, 3650 race weight, 446ci, 727, 4.56, 30x9 radial slicks - best of 10.58/125 @ 2100ft. 60ft 1.45 It was a pretty simlpe question and others were able to answer - just asking if it worked for them. Nothing to argue about either. Thank you to those who chimed in.

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my low gear set ROCKS

better ET
better 60 ft
plants tires harder and loads susp longer


installed in my CRT trans

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same here. low gear set rocks.

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same here. low gear set rocks.

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ALL is well and good ...IF you can hook. IF NOT ..you will blow-the-tires off ...

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same here. low gear set rocks.

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ALL is well and good ...IF you can hook. IF NOT ..you will blow-the-tires off ...

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for me it worked the other way, due to my limited susp travel the low gear set ROCKED

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I agree,mine slowed around a .10-.15 when I took the low gear set out in a 9.30et car.This was the only change made was convinced by others it would go quicker with stock ratio.....WRONG.

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LOL, I have heard that a time or two. I need a lower gear ratio as my car too heavy

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MAYBE you should leave your wallet IN THE TRAILER !

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Anybody switch from standard 727 gear ratios to 904 1st and 2nd ratios and improve your et?

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Without any info it's an impossible question to answer. With info it's a 75 post re-hashed arguement.

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'66 Coronet, 3650 race weight, 446ci, 727, 4.56, 30x9 radial slicks - best of 10.58/125 @ 2100ft. 60ft 1.45 It was a pretty simlpe question and others were able to answer - just asking if it worked for them. Nothing to argue about either. Thank you to those who chimed in.

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First, according to your INFO, your car would probably benefit from the low gearset, if the car would hook. Your 60' is a tad slow for a 10.60 car; if it's spinning now, the low gearset will make it worse. Second, it's a SIMPLE question with a COMPLICATED answer, since heavy, low horsepower cars benefit more than light, high horsepower cars, and since there is no set formula that is avalible to make a choice, it's an opinionated guess at best. Since most of the posts didn't give their combos, how do you make an accurate comparison them to yours? And the arguement? There has been more posts on here than you can count debating 727 vs 904, low gears vs high gears, 'Flite vs'Glide than I can count, usually ending up being little more than typing practice, since the only "right answer" is the one that works best for YOUR COMBINATION (who would have seen that coming?).

Bottom line is, there are a lot of posts on here that people ask Q's and don't give enough info for anyone to make an EDUCATED reply. Without knowing engine specs, no one can suggest a cam (although many do). Without knowing car weight, engine specs, trans, gear ratio, etc, no one can give good advice for a converter (although many do). The more good info you give us, the better info you will get back. Some of it might even be RIGHT

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Thanks for the input, you have very valid points there. I have been contemplating putting in a low gear set for a few years. I'm freshening my trans and I think I will try it. I run caltracs w/monoleafs along with their shocks and 5 inches of susp. I'm pretty confident that I won't have traction issues - there is only 1 way to find out right? Thanks again

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Good luck with your project! Unfortunately, it is a lot more expensive to put the low gear set in a 727 than a 904; they start out over $500 at A&A. 904 low gear sets are dirt cheap, being OEM in about 15 years of cars and trucks.

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My GTX was a solid 12.3 car when i changed and went about a 10th faster after that maybe a tad more. had gear out and when car was 11.00 to 10.9 put it back in and it was again a good .10 to .15 better after the change.
Nice increase through first and second little bigger drop off to third gives some back
stock
2.45 1st and 1.45 second
low set
2.74 1st 1.55 second.

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A little looser converter probably would have helped "giving some back" in third - wouldn't have let the RPM drop quite as much. Shifting at 6800 there is about 300 RPM difference in RPM drop - from 4400 to 4700 - between the 2 gear sets. A converter stalling over 4800 -5000 (or higher) probably wouldn't give anything back, and if it just a slight increase from the old one could be just as efficient on the top end.

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Thanks for the input, you have very valid points there. I have been contemplating putting in a low gear set for a few years. I'm freshening my trans and I think I will try it. I run caltracs w/monoleafs along with their shocks and 5 inches of susp. I'm pretty confident that I won't have traction issues - there is only 1 way to find out right? Thanks again

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Good luck with your project! Unfortunately, it is a lot more expensive to put the low gear set in a 727 than a 904; they start out over $500 at A&A. 904 low gear sets are dirt cheap, being OEM in about 15 years of cars and trucks.

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